Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,671	$ 2,736	$ 8,957	$ 7,746
Other comprehensive income:
Unrealized holding gains (losses) arising during the period on available-for-sale securities	355	826	1,988	555
Amortization of unrealized losses on held-to-maturity securities	165	167	457	590
Reclassification adjustment for net gains included in net income			(893)	(370)
Total other comprehensive income (loss)	520	993	1,552	775
Tax effect	(197)	(379)	(590)	(295)
Other comprehensive income (loss), net of tax	323	614	962	480
Comprehensive income	$ 2,994	$ 3,350	$ 9,919	$ 8,226